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Iridium spark plugs (2008)

Discussion in 'Norton Commando Motorcycles (Classic)' started by COMMANDO1954, Sep 15, 2008.

  1. Triton Thrasher

    Triton Thrasher

    Joined:
    Feb 10, 2009
    The grit doesn’t visibly abrade the steel.

    A brass wire brush can leave a conductive residue on the ceramic insulator.
     
  2. SteveA

    SteveA VIP MEMBER

    Joined:
    Dec 20, 2011
    Wire brushing tends to damage the insulator and cause tracking of the spark....not good for expensive plugs....

    Iridiums are not designed to be cleaned, their design is to accommodate staying in a motor pretty much for the life of the motor. Of course that only works with a refined fuel injection system that keeps them clear of excess fuel!

    I use iridiums in race motors where you are going to be replacing plugs long before they are life expired.
     
  3. xbacksideslider

    xbacksideslider

    Joined:
    Aug 19, 2010
    Sheesh . . . . IIRC, my iridiums haven't seen daylight in the best part of ten years.

    Tri-Spark, PWK flatslides from Jim Schmidt, and Denso iridiums. No problems . . . and I set the gaps wide too.
     
  4. SteveA

    SteveA VIP MEMBER

    Joined:
    Dec 20, 2011

    Says as much for the carburation as the plugs/ignition! :D

    Yes I prefer Denso, not least because there are less fakes out there than with NGK! I have never set a gap on then, just install straight from box!
     
  5. xbacksideslider

    xbacksideslider

    Joined:
    Aug 19, 2010
    Yes, :D thanks. Agreed, there is no necessity to widen the gaps, the factory sets them to a common denominator and they function perfectly but I pay extra for them in order to get what they do best - bridge big spark gaps.

    I think I can use the word "always" here; all things equal, a long fat spark is always better.

    Yes, that wide gap speaks to all three - mixture, ignition and plugs. Electronic ignition ensures the power to bridge a wide gap; sharp pointed plugs enable that wide gap to be even wider, and that longer spark attenuates low speed inadequacies of fuel atomization. In other words, they help transitional mid-range; when the mixture's confused, they help.

    I learned a related thing when using accelerator pump carbs on Ducati singles, fine point plugs help there too for, I imagine, the same reason - any momentary richness that the accelerator pump may cause can be cured (or masked ;)) with a stronger spark. Those bikes needed help coming off corners, pumpers and platinum :D .
     
  6. marinatlas

    marinatlas

    Joined:
    Nov 4, 2007
    Hi, are you speaking about pulsar plasma core plugs .........??
     
  7. xbacksideslider

    xbacksideslider

    Joined:
    Aug 19, 2010
    No, I have no experience with pulsar plasma core plugs.
     
  8. baz

    baz VIP MEMBER

    Joined:
    May 26, 2010
    How wide do you go with your plug gaps?
     
  9. xbacksideslider

    xbacksideslider

    Joined:
    Aug 19, 2010
    I don't recollect with the Norton. With all my vehicles, I widen them until I get a miss under load, then, having gone too far, I go back, narrower. My typical experience though is 30 or 35 thou.
     
  10. baz

    baz VIP MEMBER

    Joined:
    May 26, 2010
    Ok cheers
     
  11. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    I didn’t think you were supposed to gap the exotic plugs ?
     
  12. Lorenz

    Lorenz

    Joined:
    Aug 14, 2017
    I also bought Iridium for my 805 MKIIA and will not again waste money for Iridium. Personally found no benefit.
     
  13. JimNH

    JimNH

    Joined:
    Jan 4, 2014
    I put spark plugs in my blast cabinet all the time with fine results. Just a quick blast with medium fine glass beads cleans them with no visible erosion of the electrodes.

    Aircraft spark plugs are cleaned like that all the time due to lead build up. Many pilots were taught not to lean the mixture below 5000' and aircraft fuel systems are generally set up for rich mixture for cooling in takeoff and climb. Avgas, even the low lead variety, has lots of lead still.

    Anyway, a wire brush cannot clean the insulator very well and a quick blast of glass beads will. Wash out with brake cleaner followed by a blast of air and there's no grit left to hurt anything.
     
  14. xbacksideslider

    xbacksideslider

    Joined:
    Aug 19, 2010
    Yes, nothing wrong with blasting plugs if you have sharp eyes (or an old Champion spark plug lighted loup) to look for any glass bead that might be wedged between the insulator and the shell. Then use a sewing needle to dislodge.
     

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